Boat raising and lowering device



(N0 Model.)

J. STEVENS.

BOAT RAISING AND LOWERING DEVICE.

No. 431,534 Patented July 1. 1890.

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UNITED STATES PAT NT OFFICE.

JOSEPH STEVENS, OF TRENTON, MICHIGAN.

BOAT RAISING AND LOWERING DEVICE.

SPECIFICATION forming part of Letters Patent No. 431,534, dated July 1, 1890.

Application filed January 14:, 1890. Serial No. 336,960. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH STEVENS, a citizen of the United States, residing at Trenton, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Boat Raising and Lowering Devices, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in boat raising and lowering devices; and the invention consists in the peculiar construction of winding drums arranged in the bottom of the boat, and of apparatus for rotating said drums to wind up the rope and the friction-brake to be used in lowering the boat, and, further, in the peculiar combination, construction, and arrangement of the various parts, all as more fully hereinafter described and pointed out.

In the drawings, Figure 1 is a diagram elevation of my device, showing the boat in longitudinal section. Fig. 2 is an enlarged elevation of the winding and brake apparatus. Fig. 3 is a section on line 00 0c in Fig. 2. Fig. 4 is an end elevation of Fig. 3. Fig 5 is a cross-section of one of the winding-drums.

My device is especially designed to be applied to boats swung upon davits or life-boats, or other boats of that kind which are lowered from an elevated position into the water.

A represents a boat, in the bottom of which I secure a double Windlass B, which consists of the shaft a and the winding-drums b b one at each end of the boatand of the winding mechanism 0. consists of the gear-Wheel (l, secured to the shaft a and meshing with the gear-pinion e, which is secured to the shaft f, slidingly se- The shaft f is provided with notches h 7t, with which the handle 2' engages, being held therein by the tension of the spring j.

k is a handle upon the end of the shaft f,

whereby it may be moved horizontally, so that the pinion e engages with or is disengaged from the gear-wheel d.

Z is a friction-wheel secured upon the shaft CL and having the ratchet-wheel 0% upon one This winding mechanism 0 is a rope, connected at its upper end to the davit or at any suitable support, and provided at the lower end with the loop D, engaging over the pin E.

To raise the boat, the loop D is engaged over the pin E and the shaft f is moved by the handle is, so that the pinion'e engages with the gear-wheel d, in which position it is locked.

by the handle 4. Motion is now given to the winding-drums through the mechanism described, the operator turning the crank-handle o. It is evident that in this way the rope will be wound upon the drums and the boat elevated. The pawl 01, engaging into the ratchet m, will prevent the unwinding of the rope from the drums.

F is a brak e-strap secured at its lower end to the supporting-standard, passing around the friction-wheel Z, and secured at its upper end to the eocentricp, which is secured to the shaft g, which has a hand-lever 4', provided with a spring-catch 1", adapted to engage into the segmental rack s at any point of adjustment. v

To lower the boat, the pawl n is disengaged from the ratchet-wheel m and the shaft f is moved, so that the pinion e is out of engagement with the gear-wheel d, being held in its adjusted positionby means of the handled. The hand-lever r is depressed to bring the frictionstrap F against the friction-wheel Z. By tightening or loosening this friction-strap upon the wheel it is evident that according to the weight of the boat and the tightness of the strap the boat will ascend, unwinding the rope from the drums until the end is reached, when the rope upon both drums will be simultaneously disengaged by the loop D slipping out from the pin E. By making this arrangement in the bottom of the boat independent of the tackle usually used in connection with the davits the boat may be lowered without the danger of upsetting, which has been the cause of considerable trouble and the loss of many lives in the past.

That I claim as my invention is- 1. In a device of the kind described, the combination, with the boat, of the shaft a, journaled in the bottom thereof and extending from end to end and provided at each end with the winding-drums, and the rope detachably secured thereto at its end, the detachable winding mechanism and the brake mechanism located midway between the drums, substantially as described.

2. In a device of the kind described, the combination of the shaft a, the drums Z) Z) on its ends, the rope C, having the loop D, the pin E upon the drum over which said loop is placed, the gears 61 6, located centrally between the drums, the sliding shaft f, on which the geareis mounted for locking the devices, the friction-wheel Z on the shaft a, the brakestrap F on the wheel Z, the eccentric p, and the hand-lever q", to which said strap is connected, substantially as described.

3. In a device of the kind described, the combination of the shaft a, the drums b b on the ends thereof, the rope C, detachably secured thereto, the gears d 6, located between the dru1ns,,the latter arranged above the former, the sliding shaft f, on which the gear 6 is mounted, having notches h h therein, the hand-lever '1 for engaging with the notches, the spring j, contacting with the lever, the crank 0 on the shaft f, the friction-wheel Z on shaft a, the brake-strap F around wheel Z, the eccentric p, to which the strap is connected, shaft (1, hand-lever a" for moving the eccentric, ratchet-wheel m onshaft a, and pawl n, engaging with the ratchet-wheel, the parts being arranged to operate substantially as and for the purpose described.

In testimony whereof I affix my signature, in presence of two witnesses, this 8th day of January, 1890.

JOSEPH STEVENS. Witnesses:

JAMES WHITTEMORE, M. B. ODOGHERTY. 

